试题详情
单项选择题下面SQL语句都使用了聚合函数,其中选项()存在错误。

A、SELECT MIN(au_lname) FROM authors

B、SELECT ADD(ytd_sales+1) FROM titles

C、SELECT type,MAX(price) FROM titles GROUP BY type ORDER BY type

D、SELECT COUNT(*) ,avg(price) FROM titles WHERE advance > $1000

  • B
  • 关注下方微信公众号,在线模考后查看

热门试题